1888 – Was well schooled in Latin and Greek at Clifton College before coming up to Corpus Christi College, Oxford.
1890 – Obtained a first in classical honour moderations.
1893 – Allen dedicated himself to the ambitious task of editing the letters of Erasmus: this he did in the rooms of the Rev. Charles Plummer, a senior fellow of Corpus who was himself editing medieval texts with great distinction.
– Allen took two copies of the 1642 London edition (Epistolarum Erasmi, in folio) and he cut and pasted all the letters in that edition, to act as the foundation of the new edition and to save copying the letters already printed.
1924 – He became the President of Corpus Christi College, Oxford.
1953 – Bequeathed by Mrs. Allen in accordance with the wishes of her husband.